TEV-LB0

The TEV-LB0 carries a 128x64, black/white WINSTAR WG12864A LCD panel. This panel is based on a SAMSUNG S6B0108 controller (there are two controllers on one panel). The WG12864A does not have contrast control, so the contrast control circuit is added externally. Additionally, there is a control line for the LCD panel's backlight. The image displayed on the panel is not visible unless the backlight is turned on.

Interconnection Between the EM1000 and the Panel/Contrast Control/Backlight Control

Pin #⁽¹⁾	EM1000 I/O line	Panel
5	GPIO48	CTRST_SET⁽²⁾
6	GPIO47	BL⁽³⁾
7	GPIO46	EN
8	GPIO39/P4.7	D7
9	GPIO38/P4.6	D6
10	GPIO37/P4.5	D5
11	GPIO36/P4.4	D4
12	GPIO35/P4.3	D3, CTRST3⁽²⁾
13	GPIO34/P4.2	D2, CTRST2⁽²⁾
14	GPIO33/P4.1	D1, CTRST1⁽²⁾
15	GPIO32/P4.0	D0, CTRST0⁽²⁾
16	GPIO44	RST
17	GPIO43	D/I
18	GPIO42	R/W
19	GPIO41	CS2
20	GPIO40	CS1

Pin number on the TEV-LB0 connector.
The line of the contrast control circuit, not the LCD panel itself.
Backlight control line.

Required Tibbo BASIC/C Initialization Code

This section assumes that you are familiar with Tibbo BASIC/C and Tibbo IDE (TIDE).

For correct panel operation, click Project-> Settings, and select the EM1000 or EM1000G platform. Additionally, click Customize to open a Customize Project dialog. In the dialog, double-click the Display Panel Type line and choose Samsung S6B0108 (Winstar WG12864A).

The following initialization code should also be added to your project:

Tibbo BASIC

							lcd.iomapping="44,46,40,41,43,42,4" 'RST,EN,CS1,CS2,DI,RW,data_bus
							   
							io.num=PL_IO_NUM_46
							io.enabled=YES
							 
							io.num=PL_IO_NUM_44
							io.enabled=YES
							 
							io.num=PL_IO_NUM_40
							io.enabled=YES
							 
							io.num=PL_IO_NUM_41
							io.enabled=YES
							 
							io.num=PL_IO_NUM_42
							io.enabled=YES
							 
							io.num=PL_IO_NUM_43
							io.enabled=YES
							 
							lcd.width=128
							lcd.height=64
							lcd.rotated=NO
							lcd.inverted=NO
							lcd.enabled=YES
							set_lcd_contrast(11)
						

The set_lcd_contrast() procedure should be called after the panel initialization. The procedure sets the contrast level in 16 steps — the contrast control hardware only has four data lines. Therefore, the contrast level of 16 is equal to the contrast level of 0.

Here is the suggested code for this function:

Tibbo BASIC

							Sub Set_lcd_contrast(level As Byte)
							'Contrast control shares the data bus with the LCD. Initialize LCD first,
							'then set the contrast (before LCD initialization the bus may be driven
							'by the LCD)
							 
							   'enable port, output data
							   io.portnum=PL_IO_PORT_NUM_4
							   io.portenabled=255
							   io.portstate=level
							   
							   'generate strobe for the data register (on the LCD PCB)
							   io.num=PL_IO_NUM_48
							   io.enabled=YES
							   io.state=HIGH
							   io.state=LOW
							   
							   'disable port
							   io.portenabled=0
							End Sub
						

Use the following code to turn on the backlight:

Tibbo BASIC

							io.num=PL_IO_NUM_47 'backlight
							io.enabled=YES
							io.state=LOW
						